First of all, I'll try to throw the negative issues here first; if you can overlook mine as you gather the 765T's feedback with others, then feel free to look at the good things. And some bad/ugly may be also good, and vice-versa.
THE BAD (and UGLY):
I've had the 765T since late last fall 2009. It's been quirky with the touch screen and also with a hangup with regards to the user inputting information; trying to type for any extended period of about 10 or more characters and it suddenly won't respond to typing for about 15 seconds or so. I've actually just finished *finally* writing to Garmin's website requesting help with resolving these issues but they have a 3-day lag time with which to respond. I hope I can follow through and keep any interested people informed as I update this.
I have just finished installing another map update, today Sept 1. It's my 3rd (the first being the initial latest mapping update, then two unlimited ones). The previous one in May worked fine yet there are some instances still, where streets that are quite old enough to be on the map still aren't there (seemingly, very small streets) or that they are dead-ends and not through streets (this is rare).
The unit's wire stinks. I don't care for the way one has to plug the wire into the mount because the plug is behind the mount and the unit's seat. And the wire is very thick, with a large square thing near the plug. I hang the wire around my mirror and that cord is truly not the best type of cable (straight, non-coiled, with the 4-inch plastic thing near its end) I've had on a GPS.
I'm still learning the variables to the "quickest route" option. I just tried using "most fuel efficient" as an option, but it just seems as though there are instances where I second guess the unit, which seemingly doesn't factor in traffic lights and traffic. How often have I been taken into traffic and *then* seen the green traffic indicator turn yellow (as if I'm the one whose unit sends a signal to live traffic that there's a significant slow-down).
There are also some kind of alerts, but even now, I simply don't understand why, for instance, I get a warning while driving south on I-95 about Laurel, Md (whose city center is miles away). I have gotten these alerts yet I still for the life of me don't get what I'm being alerted about.
I still don't understand why my favorites aren't easily accessible. Other units I've had, like Navteq and TomTom have let me dive right into them when searching for favorites. But try to get to my work destination and I have to look through previous destinations instead.
If you've had the unit powered down, or if you're traveling to a different city where the unit's off for the change (flying for instance), the unit can take a long time to locate the new batch of satellites. How often I've had to power down the unit and turn it back on to try making my unit find them faster? I now bring my unit on planes with me and have them powered up while in flight and after landing, to get it to know my new location before I have to wait in a rental car at an airport for the 765T to figure where I am.
I've had unit crashes/restarting on a few instances. Unsure whether it's the unit, solar flares or some alien life form shadowing me...
THE GOOD:
I love the lane assist because I tend to be in areas or states I'm very unfamiliar with. Many of the visualizations are very similar to what the lane-assist screen show.
The mounting hardware has worked like a charm; much better than the TomTom units I've had.
I have used "most fuel-efficient" while going to Rockville yesterday, and it helped me get around that hideous I-95 traffic between Baltimore and Rockville (@ 3:30 and 5:30 pm).
The "unlimited" map updates are welcome. They are limited to the unit you have, and that's limited to the life that the unit actually lives. But it's nice not having to plunk down additional money for another map update each quarter. At $120, is it better than getting a map book? For me, yes, because I travel all over the country, and I would have to get maps everywhere I go, which would have paid for the map update fee anyway, since a map book just for the Baltimore area (and one for the Washington D.C. area) would cost, I think, $60 each.
I feel the day/night screen change is vital. I want a map that's dark when the sun sets, and that's exactly what this does. I mean, exactly when it sets, my preferred black background screen replaces that white daylight background.
Using my unit regularly, it truly can locate the satellites and be ready to start very soon.
MY CONCLUSION:
Honestly, it's my unit now, beyond time to send it back. If I had known what I do now (esp. after searching for "Nuvi 765T problems") I wouldn't have gotten it.
I tried the bluetooth feature which worked OK, but I still have stopped using it to answer my Bluetooth-enabled phone. I don't bother taking pics of my favorites to add to the unit's database, and what's the point of adding mp3 files via SD card when my iPods work fine, and yield better music experience?
I'm still adjusting to the unit's quirks and limitations. But I still love it more than having to stop and look through a paper map book for an address. I still feel a bit compelled to get paper map books as a backup. I mean, the mapping software tends to be dated by the time it gets ready for downloading. But I do hope my unit stays in operation for years, so I can take advantage of those mapping updates. I sure hope this helps.